Question

Calculate the molarity of a solution prepared by dissolving 12.8 g

of Na2CrO4
in enough water to produce a solution with a volume of 880. mL
.

Answer 1

To calculate the molarity of the solution, divide the number of moles of Na2CrO4 by the volume of the solution. Hence the molarity is 0.090 M.

Step-by-step explanation:

To calculate the molarity of the solution, we need to first determine the number of moles of Na2CrO4. We can use the formula mass of Na2CrO4 (161.97 g/mol) and the given mass of 12.8 g to calculate the number of moles:

mole = mass / formula mass

mole = 12.8 g / 161.97 g/mol = 0.079 mol

Next, we need to determine the volume of the solution in liters:

volume = 880 mL / 1000 mL/L = 0.880 L

Finally, we can calculate the molarity:

molarity = mole / volume

molarity = 0.079 mol / 0.880 L = 0.090 M